Sewing-machine.



G. P. GRAY. SEWING MACHINE.

APPLICATION FILED NOV. 25, 1911.

Patented Nov. 3, 1914.

3 SHEETS-SHEET 1.

WITNESSES:

A TTORNEY G. P. GRAY. SEWING MACHINE.

APPLIGATION FILED NOV. 25, 1911.

1 1 1 5,66 3 Patented Nov. 3, 19.14.

13 SHBETSSHEET 2.

Giza/r2661 Gray.

A TTORNEY G. F. GRAY.

. SEWING MACHINE.

1,1 APPLIGATIOH FILED NOV. 25., 1911. 3, 3 SHEETS- 5KB 3.

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A TTORNEY arias r are CHARLES E. GRAY, 0F SIERRA MADRE, CALIFORNIA, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CQRPURATION OF NEW JERSEY.

SEWING CHINE,

specification of Letters Patent.

Application filed November 25, 1911.

Patented Nov. 3, 1914. Serial No. 662,303..

To all whom it may concern Be it known that 1, CHARLES F. GRAY, a citizen of the United States, residing at Sierra Madre, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in lock stitch sewing machines, and has for its object to improve the means employed for casting the loop of needle-thread about the mass of bobbin or under thread.

In the early forms of sewing machine constructions of the character above referred to, there was employed in combination a rotary loop-taker having variable motion and provided with a substantially long loop-seizing point, in connection with a substantially ong point needle and cam-actuated take-up, which form of construction was in many res ects superior to the later constructions, as the long point loop-taker permitted the withdrawal of the needle eye out of the fabric while the point of the loop-taker was entering the loop, the cam-actuated take-up served to guard the needle-thread loop against being entered a second time by the loop-seizing point of the loop-taker, and the long point needle made it much easier to ierce fabrics of substantially firm texture,

ut owing to the employment of the camactuated take-up such constructions were not adapted to the hi h speed of 3000 or 4000 stitches per minu e common in connection with the present high speed sewing machines.

To efiect the high speed of the present machines, link take-ups were introduced in connection with so-termed short point needles and short point rotary looptakers, the latter being given one effective or loop-seizing and one idle rotation to one complete actuation of the needle, such form of needles and loop-takers being necessary to accommodate the action ofthe link takeup. The more desirable form of'construction, however, com rises the combination of lon point loop-ta cers, long point needles an link take-u s, together with means for assisting the ta e-np to disenga' the needie-thread loop from the 'loop-seizing point of the loop-taker before the latter commences its idle rotation, and to meet these requirements. the loop-taker is provided with a wall loop-disengaging which latter engages the needle-thread loop as it is about to be cast free from the bobbin and controls a sufficient amount of needle-thread to remore its loop from the loop-seizingpoint of the loop-taker prior to the latter completing lts eiiective rotation, as illustrated in Fig. 8, so that said loop will be free to be acted on by the take-up during the idle rotation of said loop-taker, thus making it practical to employ the more desirable form of loopse zlng point and needle point and dispense w1th the cam-actuated take-up which, as prevously stated, is not adapted to high spee i Referring to the accompanying drawings, in the several figures of which like arts are similarly designated, Figure 1 is a ront slde elevation of one 'form of commercial sewing machine equipped with the present invention. Fig. 2 is an underside View of Fi 1. Fig. 3 is a plan view ofthe front en of the sewing machine bed-plate shown in Figs. 1 and 2, partially broken out to better illustrate the mounting of the looptaker. Figs. 4, 5, 6, 7, 8 and 9 illustrate the relative action of the loop-taker and take-upat various stages in the formation of the stitch, the arrows indicating the direction of movement of the take-up at the time the thread loo is in the position illustrated' in the same gure. Fig. 10 is a plan view of the loop-taker, showing the needlethread about to be released from the control of the loop-taker. Figs. 11 and 12 are plan views of the loop-takers shown in Figs. 4 and 5. ig. 13 comprises an underside view and a view in central section of the back. slide plate shown in Fig. 1. i

The present invention is shown as applied to a Singer 109' class machine (compound feed), but as it deals principally with the construction of the loop-taker, only such reference will be made to the other elements of themachine as is deemed necessary for a proper understandi of its application.

Referring to, the Ewes, 1 represents the bed-plate of the sewing machine upon which is mounted the bracket arm comprising the am; bracket 2 and standard 3, 4 the main or needle-bar-driving shaft provided at its rear end with a band or hand wheel 5 and at its opposite end with a shaft flange 6 to which is pivotally attached the needle-baractuatingl mmachine and connected with the main or needle-bar-actuating shaft by suitable crank connections as 17, said 'loop-taker-actuating shaft carryingl near its forward end a spiral gear 18 whic meshes with a like gear19 carried by the loop-taker shaft 20, and as the ratio of said gears is as twoto'one, the loop-taker is givenone idle and one efiective or 100 -seizin revolution to one revolution of sai main s aft, as is common in connec--.

tion with machines employing a loop-taker having two revolutions toone of the main shaft.

21 represents the feed drive shaft connected at its rear end by an arm 22 with a feed connection 23 whose upper end is connected in the usual manner with a suitable eccentric (not shown) carried by the main shaft, the forward end of said feed drive shaft carrying the. commonl -employed feed-bar 24 provided with a feed dog 25 and with a forked end 26 which embraces an eccentric 27 carried by the looper-actuating shaft 16, thus, through the action of the shaft 21, horizontal movements are transmitted to the feed-dog 25 and, through the action of the eccentric 27, said feed-dog is moved verticall in a manner common to four-motion fee ing mechanisms, but as the present invention does not rely for its effective action upon the character of the feeding mechanism employed, further reference to the latter is deemed unnecessary.

While not essential, it is desirable in connection with a rotary loop-taker to employ mechanism for insuring that the needlethread will have a free passage about the bobbin, and in'the present instance there is employed well-understood means comprising a rigid stop member 28 against which the shoulder 29 of the bobbin-case 30 rests, except at such time as the free end of the lever 31 is actuated, through suitable connections, as 32, operated by an eccentric 33, to move the-projection 34 of the bobbin-case 30 in a direction opposite to that of the rotation of the loop-taker, thus separating the elements 28 and 29 for the passage of the needlethread as it is cast about the periphery of the bobbin-casc at the side opposite the line limit the movement of 1,11s,eea

of needle actuation, when tne eccentric 33 acts on the lever 31 to move its free end out of engagement with the pro ection 34 when,

through the frictional contact of the loop-f taker with the bobbin-case, the shoulder 29 is again brought into contact with the stop 28, thus effecting the opening 35 for the passage of the needle-thread as it is drawn by the take-up from engagement with the loop-taker, a stationary stop 36 acting to the projection 34 when acted on by the free end ofthe lever 31, the same as is represented'by U. S. Patent No. 1,000,797, dated August 15, 1911, with the exception that int e patent the loop-taker is mounted to rotate in a vertical lane instead of in a horizontal plane, as in the present construction.

.All of the foregoing parts are commonly found in sewingmachmes of the present class, and are herein shown as best representing one form of construction to which the present invention is applicable.

In the present instance, the bobbin-case is retained in the rotary loop-taker 37 in a manner common to rotary loop-takers employing a centrall located non-rotatin bobbin-case, and t e bobbin 38 is 'hel against accidental vertical movement in the bobbin-case 30 by a rojection 39 formed on the underside of t e slide plate 40 (see Fig. 1).

In Figs. 4 and 11, the loop-seizin point 41 is shown as having just entered the loop ofthe needle-thread in the formation of a stitch, in Figs. 5 and 12 the loop-taker is shown advanced sufiiciently to carry the loopof the needle-thread to the base or throat 41' of the loo -seizing point 41, and in Fig. 6 the loop-ta er shown advanced to a position where it is about to cast the loop past the diameter of the bobbin intersecting the line of needle actuation, and it is substantially at this oint inthe formation of the stitch that t e loop-disengaging member comprising the wall 42 extending inward from the face or outer surface of the loop-taker engages the 100 of needle-thread, as shown in Fig. 7; and uring the further rotation of said loop-taker the take-up and wall 42 act to draw. the thread loop oil the loop-seizing point of the loop-taker, back of the guard 44 and onto the finger 43, as shown in Fig. 8, the guard 44 being for-med integral with the commonly employed hook-washer 45 provided with the needleguard 46. In the rotation of the loop-taker from the position shown in Fig. 8 to that shown in ig. 9, the wall 42 is carried out of operative relationship with the thread loop, leaving the latter out of the path of travel of the loop-seizing point of the looptaker, as shown in the figure last referred to; and in the continued operation of the loop-taker its loop-seizing point is carried past the line of vertical movement of the thread 100 in its travel into the fabric, as shown in, l ig. 10. It will thus be obvious that the loop-di$engaging wall 42 acts to control SllfilClIlfl'Of the needle-thread loop,

with fabric-feeding and stitch-forming,

mechanismincluding a rota main-shaft, a loop-taker shaft havin mu tiple rotations to one of said main-s aft, and a needlethread take-up operated from .the actuating mechanism of the sewing machine through a link connection of a loop-taker carried by said loop-taker shaft and provided with a loop-seizing point, and a needle-thread-loopdisengaging wall, the latter and the take-up acting to draw the needle-thread loop of! the loop-seizing point of the loop-takerbefore the latter completes'its effective rotation.

2. In a, sewing machine, the combination with fabricfeeding and stitch-forming mechanism including a rota main-shaft, a loop-taker shaft havin mu tiple rotations to one of said mainaft, and a needlethread take-u operated from the actuatin mechanism 6 the sewing machine throu E a link connection of a loop-taker carried y said loop-taker shaft and'provided with a loop-seizing point and'a needle-thread-loopdisengaging wall, the latter inclined inward y from the face of said loop-taker, said loopdisengagimg wall and take-up acting to draw the nee -thread 100 off the loop-seizing point of the loop-ta er before the latter completes its effective rotation.

3. In a sewing machine, the combination with fabric-feeding and stitch-forming mechanism including a rotary main-shaft, a loop-taker shaft havingmultiple rotations to one of said main-shaft, and a needlethread take-u operated from the actuatin mechanism 0 the sewing machine throug a link connection, of a 100 -taker carried by said loop-taker shaft an provided with a loop-seizing point, a finger and a 100 -disengaging wa l, the latter and said ta e-u actin to draw the needle-thread loop 0 said oop-seizin point before the loo -taker completes its e ective rotation, and t e further action of said loo -taker and take-up causingmaid loop to en aged by said finger until the latter is wit drawn by the rotation of the loop-taker, when said needlethread loop is drawn bythe action of the take-up to its stitch-formin position.

In testimony whereof, I i: name to this specification, in the presence of two subscribing witnesses.

CHARLES F. GRAY.

ave signed my 

